Combination electric drive



Ndv. 20,1928.

1,692,371 c. FROESCH COMBINATION ELECTRIC DRIVE Filed Feb 9, 1927 2 Shei-Sheet INVENTOR aarwoaso Patented Nov. 20, 192s. I 1,692,371 UNITED STATES PATENT OFFICE.

CHARLES FROESCH, OF NEW YORK, N. Y., ASSIGNOR TO INTERNATIONAL MOTOR COM- PANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

COMBHTATION ELECTRIC DRIVE.

Application filed February 9, 1927. Serial No. 166 860.

The present invention relates in general to the unit itself. In carrying out this idea the mountings for motor generator sets, and control box It is mounted upon the housing more particularly deals with such mountings as shown in Figures 1 and 2, and the operatin connection with automobiles of the gasing shaft for the control is indicated at h.

3 electric drive type. In service of this charac- This construction eliminates chassis Wiring ter, it is highly desirable to reduce the weight and is highly desirable from the standpoint of the units and mountings as far as possible, of assembling the chassis and the servicing and cut down the.room consumed and the thereof. length required by these elements. Referring particularly to Figure 2, 2' indi- The presentinvention seeks to provide a cates the field of the generator and z" the unitary mounting for a motor generator set armature. Bolted to the armature, as at j, is by means of which the ventilation of the units a fan 70 having three series of blades Z2, 70 and can be greatly improved, and in addition to W. The housing a mounts the generator arcutting down the weight, the overall length mature and motor armature by suitable beartaken by the drive may be shortened considings c and 0*, respectively, which are carried erably. Although it is quite general pracby the inwardly extending annular web 0 tice to combine the motor and generator units This web is provided with an annular series in a single drive, and mount them in a unitary of openings 0 to permit the proper ventilamanner, the present construction additionaltion of the motor armature. Varies of the ly provides an improved means for ventilatfan serve to ventilate distinct parts of the in the units and for the control thereof. unit as follows: Vanes is ventilate the geneference will now be had to the accomerator field, whereas-vanes 70 serve to venpanying drawings forming a part of the tilate the armature exclusively. The arrows specification, wherein: in Figure 2 illustrate this quite clearly.

Figure 1 is a side elevation of the unit Vanes 70 serve to cool the electric motor exmounting of the present invention. clusively and air is drawn from vents b Figure 2 is a side elevation, partly broken through the motor and vents a and expelled away and in section, showing the fan and through vents o. In theventilation of the associated construction. generator air is drawn through vents e In the drawings, a designates the generator" through the field and armature, respectively, and b the motor. Connecting the two is an and expelled through vents c by means of intermediate housing a which is bolted the respective blades 70 and 7,1 Obviously, against the adjacent ends of the generawl'lif desired, a double set of vanes with suitand motor, and provided with vents c. In able battles in the housing a may be used to order tostrengthen the unit and provide a provide separate ventilation for both the more rugged construction webs a may be motor field and armature core. formed upon the housing. At either end, end By ventilating the units in the manner decaps a and b are provided to enclose the scribed above wherein the fan is driven from unit completely. Suitable vents a and b the generator, it is possible to obtain a high are formed in these caps'and form the means fan speed at low motor and therefore, vehicle whereby air enters the units for cooling purspeed. This is of great importance when poses. A trunnion a) on the end cap a forms climbing a grade since at that time the motor the bearing for the enerator end and bolting speed is low, but the generator speed is high. pads e,at either sife of the end cap 6 f rm Under these circumstances, greater ventilaa means for supporting the unit at the other tion is required for the parts than could be end. It will be evident that a three point obtained by driving a fan from the motorsuspension is provided by reason of this 0 11- When the vehicle speed, and therefore the struction and the supports to which the boltelectric motor speed 'is high, the fan speed ing pads are connected may be cushioned 1n cannot be increased beyond the maximum enrubber in a well known manner. gine speed, and therefore a saving of power The generator is driven from the engine is obtained. In a test case, the power conthrough pro eller shaft 7 and the transmissumed by the ,electric motor fan which 18 sion 9 supplies the power for the final drive. bolted on the electric motor armature was An improved feature of the present conabout 2 horse ower at 30 miles per hour and struction is the mounting of the control upon as, at that vehicle speed, the maximum engine power is not required, this horsepower is saved by the mounting of the fan upon the generator and better performance of the bus is obtained. It is evident that the operation of. the power units inthis form of drive serves to control automatically the speed of the fan to that required under the various.

conditions of service and a highly desirable unit is provided.

Although the invention has been illustrated and described in connection with the specific construction shown in the drawings, it is not to be limited save as defined by the appended claims.

That I claim is:

1. A combination drive unit comprising motor and generator housings, a motor and generator therein having independently mounted armatures, a housingconnecting the two, means therein for supporting the motor and generator armatures independently, vents in the ends of the unit and in the connecting housing, and means carried with the generator armature for ventilating the motor and generator separately.

2. A combination drive unit comprising motor and generator housings, a motor and generator therein having independently mounted armatures, a housing connecting the two, means therein for supporting the motor and enerator' armatures independently, vents' in the ends of the unit and in the connecting housing, a fan carried with the generator armature and a plurality of series of blades thereon for ventilatingthe-motor and generator separately.

3. A combination drive unit comprising motor and generator housings, a motor and and generator armatures, vents in the ends of the unit and in the connecting housing, a fan carried with the generator armature and having a plurality of axially disposed blades forming a plurality of series of individual ventilating means, and means causing each series to ventilate the generator field, the generator armature, and the motor separately;

5. A combination drive unit comprising motor and generator housings, a motor and generator therein having independently mounted armatures, a housing connecting the two vents in the housings, an inwardly extending annular web carried thereby, a series of openings therein, means on the web for supporting the motor and generator armatures independently, a fan carried by the generator armature, means thereon for ventilating the generator and separate means thereon for ventilating the motor through the openings in the Web. This specification signed this 2nd day of February A. D. 1927.

CHARLES FROESCH. 

